Saving oranges and lemons in Europe from devastating pests
The EU is tackling plant diseases that could put the squeeze on citrus production in Spain and other Member States.
By PIETER DEVUYST
Many people love citrus fruits for their sweet or sour flavour, but plant diseases could leave fans with a bitter taste.
A blight called citrus greening is killing orange, lemon and other such trees worldwide and could soon do the same in Europe. Tiny infected insects known as psyllids are responsible for spreading the scourge, which turns tree leaves yellow and the citrus fruits bitter.
The pest originated in China, where it’s also known as Huanglongbing (HLB), or yellow dragon disease. While the psyllids in Asia are causing the most damage, an African variety of the insect that is another vector of HLB has been found in Spain and Portugal.
‘The disease is highly destructive to the citrus,’ said Leandro Peña, a biologist at the Polytechnic University of Valencia in Spain. ‘A range of varieties of citrus that are available nowadays to the consumer may disappear if this disease reaches our continent.’
Citrus production plays an important economic role in Valencia, which is Peña’s home region along the eastern coast of Spain, as well as in other parts of the country and elsewhere in the EU. Spain is the EU’s main producer of citrus fruits, which also include tangerines, mandarins, limes and grapefruit.
When it comes to oranges alone, Spain accounts for about half of total output in the 27-nation EU. Aside from being a fresh fruit and juice, Spanish oranges go into everything from marmalades and desserts to skincare products and perfumes.
The threat posed by HLB, which is incurable, is now raising alarm among local farmers and residents.
This is where an EU-funded project called PRE-HLB could offer reassurances. The research, which started in 2019, aims to develop a comprehensive strategy to protect Europe from citrus greening.
Experts from nine countries – including the Americas and Asia – are trying to prevent the disease from coming to Europe by increasing knowledge of how it spreads.
The researchers also want to be prepared in case the disease does reach Europe, so they’re developing measures to soften the impact, control it and eventually eliminate the pest if needed.
Furthermore, long-term solutions, including breeding new citrus plants resistant to the pest and coming up with methods to treat the disease such as biopesticides, are also being investigated. The project is due to end in November this year.
Peña has been working on citrus genetics and biotechnology for almost 30 years and already helped to manage the disease in Brazil and the US.
He said that Florida, known as the Orange State in the US, was once a major producer of sweet orange juice. Then, 20 years ago, citrus greening devastated trees in the region and caused production to drop by 70%.
‘The situation is a disaster,’ said Peña. ‘The fruit that they produce is of low quality, almost inedible, and they need to mix it with fruits coming from other countries to make juice that is drinkable.’
He’s worried that the same could happen in Europe and that the disease will destroy the economic and social culture of citrus in countries including Spain, Italy and Greece.
So far, only the African version of the psyllid insect has been found in Europe – not the bacterium that causes citrus greening.
However, the presence of psyllids means that the disease could spread rapidly were the bacterium to become invasive. Meanwhile, the Asian insect, which is more aggressive, has recently been found in eastern Mediterranean countries such as Israel.
Peña is warning people against bringing back plants or seeds from outside Europe, for instance after a holiday.
‘Even if you think that a citrus tree looks beautiful and healthy, it could have a disease inside and cause a very serious problem to our way of living,’ he said.
In the worst-case scenario, it could mean that European consumers can no longer enjoy local high-quality citrus fruits.
Other pests that can damage citrus fruits have already taken hold in Europe.
The larvae of moths and butterflies attack young flowers and leaves of citrus trees in spring. The insects have spread all around the Mediterranean, including in Spain, Italy and Greece.
‘If they destroy the leaves, they destroy the tree,’ said Luc Fillaudeau, a professor of bioengineering from France. ‘If they destroy the flower, they destroy the fruit.’
Along with Souad Rouis, a Tunisian professor of biotechnology, Fillaudeau led a project that has developed two biopesticides to tackle these larval pests more effectively.
Their two institutions – the Toulouse Biotechnology Institute and the Centre of Biotechnology of Sfax – have been working together for more than 20 years, including on student exchanges.
This cooperation formed the building block for the EU-funded IPM-4-Citrus, according to Fillaudeau.
The project started in 2017 and wrapped up in January this year. It used two types of bacteria, one from Tunisia and another from Lebanon.
These tiny organisms produce a natural substance that protects against the pest – the perfect ingredient for their biopesticides.
The biopesticides are now produced on an industrial scale by German company JKI, another partner in the project.
‘We have switched from research to the market and from the lab to the field,’ said Rouis.
The researchers believe that their solutions can reduce the use of synthetic pesticides while being less harmful to humans and the environment.
IPM-4-Citrus also showed that the natural pesticides are efficient and safe. The project leaders hope for approval soon to get their products on the European market.
At the same time, a goal has been to try to keep the biopesticides affordable so they can also be used in other parts of the world such as North Africa and the Middle East.
Beyond the lab
The biopesticides could soon not only save citrus but also protect other fruits from larval pests.
The researchers are already working on a new project, called PRIMA SAFWA, to tackle more plant pests with the same bioproducts.
Valuable as these goals are, the human dimension of the research is almost equally important, according to Fillaudeau and Rouis.
These projects allow both their institutions to keep working together. That in turn enables more exchanges and training of young scientists and more cooperation with people in the field.
‘Thanks to these projects, we can think out of the box,’ said Rouis. ‘We are not just scientists in the lab, but we can collaborate with other people, like farmers, for the benefit of society.’
The article was originally published in Horizon, the EU Research and Innovation Magazine.
Watching over water, Earth’s most precious resource
Satellites are helping Europe protect its lakes, lagoons and rivers.
By HELEN MASSY-BERESFORD
It is early morning on the Razelm-Sinoe lagoon in Romania when a small boat sets out with instruments and probes. The researchers on board are collecting water samples and measurements to bring to the laboratory for analysis.
Located on the shores of the Black Sea, Lake Razelm is part of the most extensive wetland in Europe and of a World Heritage site: the Danube Delta.
Close up and afar
The researchers are part of an EU-funded project called CERTO tracking water quality along coasts and in places that transition between fresh and saltwater like lagoons, estuaries and large rivers. The team gets support not just from waterborne transport but also from something much more distant: a satellite network.
‘Traditionally, people have gone out in boats and sampled,’ said Professor Steve Groom, CERTO coordinator and head of science/earth observation at Plymouth Marine Laboratory in the UK. ‘But it’s expensive and they can’t be everywhere along the coast on the same day. We’re moving towards using satellites to complement in situ monitoring.’
The Razelm-Sinoe lagoon was almost closed off from the Black Sea during the 1970s as part of a plan to create a freshwater source for agriculture.
Nowadays it only has one sea inlet. The limited water exchange with the sea, combined with mineral and nutrient run-off from nearby farms, led in the 1990s to excessive plant and algal growth and low-oxygen levels that harmed fish and wildlife in the lagoon.
The lagoon’s diversity, including varying water depths and levels of salinity, makes for a valuable study site – and the interest is not just academic. Ensuring the health of coastal waters is vital both for ecosystems and for people who make a living from activities such as fishing, farming and tourism.
The skyward help that the CERTO researchers receive is through Copernicus, the Earth observation part of the EU’s space programme. Copernicus uses satellite data to observe water quality and quantity.
‘CERTO puts the use of satellite data in the spotlight,’ said Adriana Maria Constantinescu, technical leader of a Razelm-Sinoe lagoon case study. ‘We can get good-quality data from satellite images and the work we do in situ helps improve algorithms.’
CERTO is using on-site measurements and satellite-observation data in six places. Among them are also the world-famous lagoon in Venice, Italy and the Curonian lagoon in Lithuania.
The project, due to end this September after almost four years, is investigating ways to classify water.
‘The technical term is optical water types, but it’s really just a way of saying “this water is a bit muddy” or “this area is nice and blue,”’ said Groom.
The term categorises bodies of water based on the colour of the light they reflect.
Murky green ponds, for example, contain more organic matter such as algae than clear ponds and reflect less blue light. Murky water also indicates a surplus of nutrients that could be harmful to fish and wildlife.
In this way, using satellites to measure how much light bodies of water reflect can help determine their health without needing to go out in a boat and take samples. It also gives scientists a database to draw on when analysing waters classified as the same type.
‘The value is that you don’t necessarily have to take in situ measurements to validate your algorithms everywhere,’ said Groom. ‘We’re trying to go from lakes all the way to oceans and come up with a common set of water types for all those waters.’
CERTO also wants to make it easier for scientists to use the available information on water quality and bridge existing gaps in the data.
At present three Copernicus services, each using different approaches, provide information on water quality, making it hard for scientists to have an overview. In addition, some areas such as transitional waters aren’t covered by any service at all.
The project’s legacy will be prototype software that can be “plugged in” to existing Copernicus services as well as popular open-source software called SNAP that’s used more widely in the research community.
Constantinescu, the head of a Razelm-Sinoe study, expects the CERTO work to lead to more research at the lagoon. The filtering properties of reed beds or their role in attenuating wind waves could be some of the nature-based solutions investigated to deal with coastal erosion.
Satellite data is also used to keep an eye on Europe’s groundwater.
The EU-funded G3P project tracked variations in vital groundwater reserves for three years through 2022.
The project used data both from Copernicus and from a joint US-Germany satellite mission known as GRACE that, since its start in 2002, has transformed scientists’ view of how water moves and is stored around the planet.
‘Groundwater is one of the major resources for humankind,’ said Professor Andreas Güntner, who coordinated G3P and works at the GFZ German Research Centre for Geosciences in Potsdam.
Groundwater accounts for almost a third of total freshwater resources worldwide. In the EU, it supplies 65% of drinking water and a quarter of water for agricultural irrigation.
Groundwater has also been declared an essential climate variable – a critical indicator of how the Earth’s climate is changing – by an international non-governmental organisation known as the Global Climate Observing System.
Copernicus doesn’t yet provide consistent, worldwide data on groundwater reserves and how they’re evolving.
The G3P team built a new dataset to fill that gap.
The researchers relied on information from GRACE, which has featured twin satellites. An initial GRACE mission lasted 15 years and a follow-up one began in 2018.
The distance between the two satellites changes constantly depending on the mass distribution below them. For example, when one approaches heavy masses such as mountains, ice sheets and large groundwater reserves, it speeds up and the distance from the other satellite increases.
By tracking the gravitational push and pull on the spacecraft as they fly over different landscapes, scientists were able to map out the distribution of water on and below Earth’s surface and how it’s changing.
Knowing more about groundwater reserves, their changes and how they are affected by human activities such as farming is essential as countries seek to improve the management of water resources generally.
‘In some areas of the world, taking water from aquifers for irrigation has led to more withdrawal than replenishment – in other words unsustainable use,’ Güntner said. ‘The first global observation-based groundwater dataset is really an amazing thing.’
Still, plenty more research lies ahead to make greater use of the dataset.
‘The next step is in-depth analysis of the groundwater data we obtained to try to understand how groundwater resources have changed over the last 20 years, how those changes may be related to climate change, changing rainfall and how much is due to human interference,’ said Güntner.
Research in this article was funded by the EU. This article was originally published in Horizon, the EU Research and Innovation Magazine.
With mouth-watering foods, mountain farms in Europe seek climate readiness
Tackling threats to water supply in European highlands is crucial for producers of premium foods and drinks ranging from Spanish ham to Scotch whisky.
By HORIZON STAFF
Marian Navas is at the sharp end of a major European challenge: ensuring that small-scale farmers can cope with the impact of climate change.
For Navas, a Spanish native who makes prized Iberian ham, and other traditional agricultural producers in Europe’s mountain regions, the test boils down to water. Can they count on having enough of it as global warming triggers more frequent droughts?
The answer to this question may determine whether mountain areas, which cover more than a third of Europe’s land surface, remain viable contributors to EU economic, social and cultural life. In the case of Navas and numerous others, family history is also on the line.
‘Pig farming is a business that has been the livelihood of many families, including my own, for decades,’ she said. ‘Any business that is undertaken comes with challenges and, for those directly linked to nature, climate change is an additional one.’
The threat to supplies of water needed by businesses in mountain zones from Spain to Scotland is a prime focus of the EU-funded MOVING project. The four-year initiative, which runs through August 2024, is assessing the vulnerabilities of highland agriculture and mapping whole supply chains for insights to inform new policies and give long-term answers.
‘After two years, it is very clear that one of the most important threats is from climate change,’ said Professor Mar Delgado, who coordinates MOVING from the University of Cordoba in Spain. ‘Higher temperatures and more droughts mean less snow and less water. People are worried.’
But people like Navas also appear determined to tackle the challenges being addressed by MOVING.
Also on the project’s radar is the production of foods including cheese such as Portugal’s Serra da Estrela, Italy’s Caciocavallo from the Alto Molise region and Switzerland’s Tête de Moine; lamb from France’s Val de Drôme area as well as the Austrian and Serbian Alps; carob powder – used in bread – from the Greek island of Crete; chestnut flour from the French isle of Corsica and northern Italy; and drinks like Alto Douro wine from Portugal and Scotch malt whisky.
Ensuring that such activities persist would respond to growing consumer calls for less intensive agriculture and would reinforce Europe’s economic, social and cultural richness.
In contrast to factory farming, this type of ancestral mountain agriculture is more respectful of nature and even embraces it. Indeed, such producers form an integral part of the European landscape.
Iberian ham, or Jamón ibérico, is a prime example of the economic and environmental issues at stake. Special production features give the ham a distinctive nuttiness, sweetness and tenderness, a protected designation of origin (PDO) label and a premium price.
Spain has four protected designations of origin for Iberian ham, which comes from southern and western areas of the country. The PDO system involves regulations to guarantee the meat’s origin, production methods and particular characteristics.
MOVING covers the smallest PDO, Los Pedroches, whose ham is produced from black pigs that feed on acorns, insects and grass in pastures in the Sierra Morena mountain range of southern Spain.
The combination of diet and roaming leads to a large amount of fat in the meat. A long curing process then allows development of the qualities that make the ham a delicacy.
Yet the water requirements for growing acorns and breeding pigs are putting an increasing strain on the sector, particularly traditional producers, according to Juan Luis Ortiz, secretary general of the Los Pedroches PDO.
‘Water is now one of the great limitations of our pastures, specifically for the production of acorns,’ said Ortiz. ‘Besides, pigs drink about 10 litres of water a day. The main challenge is the collection of water and its storage and, secondly, the optimisation of its use to eliminate losses.’
Some pig farmers in Spain are placing canopies over ponds from which the animals drink to prevent evaporation – an increasingly widespread technique in European hillside agriculture, according to Delgado.
‘Small ponds covered with plastics to avoid water loss are also becoming common in other places,’ she said.
Winemaker’s soil strategy
For Luca Pedron, agronomy head at sparkling wine producer Ferrari in Italy’s northern region of Trento, water scarcity has been a growing concern since a dry summer in 2003 hampered grape production.
The alert, he said, was reinforced in 2022 when a very dry year along with unusually high temperatures hurt the quantity and quality of grapes.
‘What we harvested was low in sugar content and poor in terms of acidity – exactly what we need to avoid to obtain a good quality wine,’ Pedron said. ‘What worries us nowadays is the reduced rainfall and snowfall with, at the same time, long periods of high temperatures.’
He said one response from wine producers is to increase the organic matter in soil so it becomes more fertile and, as a result, can store more water.
Covering the soil, deepening root penetration and using lighter machinery wherever possible are part of the overall answer, according to Pedron.
‘It is a strategy composed of several actions, all aiming at better soil fertility and more developed root systems,’ he said.
MOVING has evaluated the production systems and vulnerabilities in each of the 23 regions covered by the project. With 15 months still to run, it plans to deliver a roadmap of policies needed to improve the resilience and sustainability of European mountain areas.
To stick to the example of Iberian ham, this exercise will mean assessing the steps starting with pig breeding and continuing through processing, marketing, distribution and consumption in, say, a specialised delicatessen in Berlin, Paris or New York.
‘We need consumers ready to pay the high value of this product so the caring of the pastures, the pigs and the mountain areas can be made sustainable,’ Delgado said. ‘If you want these territories to be alive, you need people working there.’
Spain has around 4 000 farms that raise Iberian pigs, which number fewer than 400 000 – a fraction of the country’s total pig population of around 34 million. The Iberian-ham business is oriented to markets abroad.
Exports last year were worth more than €500 million, according to Spanish trade agency ICEX. Around three-quarters of these shipments were to other European countries including France, Germany, Italy and Portugal, while top overseas consumers included the US, Mexico and China.
Mountain regions provide plenty of public goods including water, clean air and scenery that could justify government aid for highland farming, according to Delgado.
Nonetheless, she says the other underlying strength of these areas is the local and skilled workforce committed to protecting the land and keen to show that this type of agriculture can increasingly influence consumer demand.
‘They want to have a job, an income and a livelihood,’ said Delgado.
Navas is proof of the point, expressing a determination to thrive in small-scale pig farming with the help of various possible practical improvements. These include water collection and storage systems to take advantage of rainfall throughout the year and training of farm workers to ensure proper pruning of groves and soil conditions for trees.
She said that, apart from the ultimate results that will emerge, MOVING has already been beneficial by bringing together a variety of professionals from across Europe who have enriched her thinking about the way ahead.
‘This project is having a very positive impact on my perspective of the future in this sector,’ Navas said.
Research in this article was funded by the EU. This article was originally published in Horizon, the EU Research and Innovation Magazine.
Drought in Europe and water conflicts on the rise
Europe’s Drought-Riven Future Is Here, Decades Earlier Than Expected. Fights over scarce water resources in southern Spain are likely to play out elsewhere in the region as extremely hot and dry weather strikes more often, informs Bloomberg.
A network of ditches dug in the Middle Ages has allowed farmers in the hillside hamlet of Letur in southern Spain to grow olive trees, tomatoes and onions in one of Europe’s most arid regions for centuries. Now the punishing drought that’s spreading across the continent is threatening even this ancient oasis.
The intricate system has kept the village’s land moist and cool through wars, foreign invasions and natural disasters. But the 200 farmers that rely on it are starting to worry for the first time as water levels at many of Spain’s giant dams sink to unprecedented lows and canals built in the 1970s that turned the surrounding region into an agricultural powerhouse start to run dry.
If the drought goes on much longer, Luis López, a 43-year-old olive farmer, fears that industrial farms nearby that use the modern irrigation system to grow water-intensive crops such as lettuce and watermelon might start tapping into Letur’s well-preserved supply.
The water battle brewing in Letur is a harbinger of conflicts that will play out elsewhere, and whatever happens to Spain’s farming industry — a major source of groceries for its neighbors — will be felt throughout the region.
“Spain is Europe’s breadbasket and the lack of water there, the lack of agricultural production, is a matter of survival,” said Nathalie Hilmi, an environmental economist at Centre Scientifique de Monaco. “It becomes a financial problem too, because more money needs to be spent finding food.”
Multi-year droughts can be devastating because sectors such as agriculture don’t have time to recover, so impacts pile up season after season, growing exponentially. Spanish olive oil production — which accounts for 45% of the world’s supply — will likely be more than halved this season, while grains such as wheat and barley are projected to fall by as much as 60%, according to Gabriel Trenzado, director of Cooperativas Agro-alimentarias de España, a farming industry group.
Farmers across the region don’t just have to contend with drought but also less predictable weather overall. Last year, Spain experienced a heat wave similar to the one that baked the country this April, until Storm Cyril brought an unusual drop in temperatures, leading to multimillion euro losses for fruit and nut producers. “The fact that there’s drought doesn’t mean it’s not raining, it means rains sometimes come unexpectedly,” Trenzado said. “Everything is very sensitive.”
Europe’s preparations for a drier future are struggling to keep pace with the rapidly changing climate. The continent has warmed nearly twice as fast as the rest of the world over the last three decades, according to the World Meteorological Organization, and the economic impact has been significant.
Record-low river levels have caused billions in losses from snarled freight passage. It’s also hurt electricity generation from hydropower and nuclear plants, adding to an energy shortage due to the fact that Europe imposed sanctions on Russian gas and contributing to the worst cost-of-living crisis Europe has faced in generations. Drought-driven crop failures could send food prices higher still.
The diminished trickle into Europe’s lakes and seas also compounds environmental risks by raising water temperatures and harming ecosystems, according to the Copernicus Climate Change Service. And then there’s the higher probability of wildfire, which torched European landscapes three times the size of Luxembourg last year.
It’s the second year in a row of extremely dry and hot conditions for Europe’s southwest, driven by a pre-summer heat wave that’s started three months earlier than usual. Spain just experienced its warmest and driest April on record. Elsewhere, the snow that’s accumulated in the Alps, a key source of water for France and Italy, is the lowest in over a decade, exacerbating years of below-average rains and snowfall.
Further north, Germany and the UK have experienced rain anomalies as severe as Spain’s.
The changes in weather match scientific projections for less precipitation and higher temperatures in Europe on a warmer planet, said Andrea Toreti, a senior researcher at the European Commission’s Joint Research Center, an independent scientific body that advises the bloc’s officials. But this level of drought was only expected to occur regularly in 2043.
In Italy, where a lack of water is choking the country’s most productive agricultural region, the crisis has become a government priority managed by a special unit led by Deputy Prime Minister Matteo Salvini. France, which this year suffered its longest winter rainless spell on record, has set a new target to cut water consumption 10% by the end of this decade.
“Last year’s drought was exceptional in comparison with what we had experienced, but it won’t be exceptional in comparison with what we will experience,” French President Emmanuel Macron said in a speech in March. “No one is saying this situation will improve.”
The Spanish government has scrambled to find solutions. Despite spending billions to improve its water-management system, Spain’s reservoirs are still at about half their capacity. In an emergency cabinet meeting officials greenlit a €2.2 billion package that includes tax breaks and aid for farmers, adding to measures already announced that will cost €22 billion.
Most controversially, the government will limit the amount of water used to irrigate crops. The move has angered farmers and emboldened conservative politicians ahead of local elections later this month that are seen as a bellwether for Prime Minister Pedro Sánchez’s prospects as he seeks re-election in December.
Sánchez has acknowledged that there’s no easy answer. “The debate around drought will be at the heart of the political and territorial debate in our country for years to come,” he told lawmakers in April.
Competition for water access in Spain is already pitting various groups against each other: large agribusiness and small farmers, environmental activists and corporate lobbyists, local politicians and the central government.
In Pulpí, a town in Almería, big farms have had to reduce cultivated areas, buy water from other towns and rent land further north with enough water access to maintain production. Two years ago the Negratín dam, which supplies most of Pulpí’s water, had to stop pumping as water levels plummeted.
Food growers in Pulpí have reacted angrily to the Spanish government’s plan to limit water taken from the Tajo-Segura transfer. “Without water Almería will go back decades,” said José Caparrós, an executive at a large farm who belongs to a group that manages the town’s irrigation system. “We need options to have access to water and feed the country.”
Rather than changing their practices and adapting to drier conditions in recent years, many farmers have drilled illegal boreholes to tap groundwater instead. Greenpeace estimates there are over 1 million unsanctioned wells across Spain, used mainly to irrigate crops. Sánchez is working to prevent more from popping up, but he fears the situation will only get worse as less water becomes available.
“We are swimming against the current,” he said. “The drought will only intensify this battle for water.”
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